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首页> 外文期刊>Pure and Applied Geophysics >Simulation of the seismic response of sedimentary basins with vertical constant-gradient velocity for incident SH waves
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Simulation of the seismic response of sedimentary basins with vertical constant-gradient velocity for incident SH waves

机译：垂直SH波入射速度对沉积盆地地震响应的模拟

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The simulation of the seismic response of heterogeneous sedimentary basins under incident plane waves is computed using the Indirect Boundary Element Method (IBEM). To deal with these kinds of basins we used approximate analytical expressions for the two-dimensional Green's functions of a medium with constant-gradient wave propagation velocity. On the other hand, for the homogeneous half space underlying the sedimentary basin, the full space Green's functions were used. The response of semi-circular heterogeneous basins under incident SH waves is explored by means of the displacements in the frequency-space diagrams and synthetic seismograms. Moreover, we compared these results with those obtained for other homogeneous semi-circular models. The principal differences among them are pointed out. This simulation provided interesting results that displayed a complex amplification pattern in a rich spectrum of frequencies and locations. The maximum amplitudes levels were found around the edges of the heterogeneous sedimentary basins. In time domain some features characterize the seismic response of the basin which include enhanced generation and trapping of surface waves inside the sediments, and the reduced emission of seismic energy to the hard rock. In the heterogeneous models the lateral reflections of surface waves greatly influence the total displacements at the free surface in comparison with the homogeneous models where the displacements have a shared influence among both vertical and lateral reflections.
机译：利用间接边界元方法（IBEM）计算了非均质沉积盆地在入射平面波作用下的地震响应模拟。为了处理这类盆地，我们对具有恒定梯度波传播速度的介质的二维格林函数使用了近似解析表达式。另一方面，对于沉积盆地下面的均匀半空间，则使用了全空间格林函数。利用频率空间图和合成地震图中的位移，探索了半圆形非均质盆地在入射SH波作用下的响应。此外，我们将这些结果与其他齐次半圆形模型获得的结果进行了比较。指出了它们之间的主要区别。该仿真提供了有趣的结果，在丰富的频率和位置频谱中显示了复杂的放大模式。在非均质沉积盆地的边缘附近发现了最大振幅水平。在时域上，盆地的地震响应具有一些特征，包括沉积物内部地表波的产生和捕获增加，以及向硬岩的地震能量释放减少。在非均质模型中，与均质模型相比，表面波的侧向反射对自由表面的总位移有很大的影响，在均质模型中，位移在垂直和侧向反射中都有共同的影响。

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